Frame just arrived. I've tried putting in the BB and fitted the PES Magene onto it. Everything seems to be working fine. Crank was rotating freely.
Do note that I only did a quick test fit, seems adding a bit extra spacer on the drive side will help add clearance in case of mud or dirt.
nice to hear, that it is likely to fit. Could you give some feedback after your final installation? Especially on the alignment from the middle to the left and right crankarm. not that it fits, but then is outside the middle position because of added spacers and eventually doesn't fit anymore after fitting some spacers on the left side for compensation.